it.unimi.dsi.fastutil.objects

Interface Object2ObjectMap<K,V>

All Superinterfaces:

Function<K,V>, Map<K,V>, Object2ObjectFunction<K,V>

All Known Subinterfaces:

Object2ObjectSortedMap<K,V>

All Known Implementing Classes:

AbstractObject2ObjectMap, AbstractObject2ObjectSortedMap, Object2ObjectArrayMap, Object2ObjectAVLTreeMap, Object2ObjectLinkedOpenCustomHashMap, Object2ObjectLinkedOpenHashMap, Object2ObjectMaps.EmptyMap, Object2ObjectMaps.Singleton, Object2ObjectMaps.SynchronizedMap, Object2ObjectMaps.UnmodifiableMap, Object2ObjectOpenCustomHashMap, Object2ObjectOpenHashMap, Object2ObjectRBTreeMap, Object2ObjectSortedMaps.EmptySortedMap, Object2ObjectSortedMaps.Singleton, Object2ObjectSortedMaps.SynchronizedSortedMap, Object2ObjectSortedMaps.UnmodifiableSortedMap

public interface Object2ObjectMap<K,V>
extends Object2ObjectFunction<K,V>, Map<K,V>

A type-specific Map; provides some additional methods that use polymorphism to avoid (un)boxing, and handling of a default return value.

Besides extending the corresponding type-specific function, this interface strengthens entrySet(), keySet() and values(). Maps returning entry sets of type Object2ObjectMap.FastEntrySet support also fast iteration.

A submap or subset may or may not have an independent default return value (which however must be initialized to the default return value of the originator).

See Also:

Map

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	Object2ObjectMap.Entry<K,V> A type-specific Map.Entry; provides some additional methods that use polymorphism to avoid (un)boxing.
static interface	Object2ObjectMap.FastEntrySet<K,V> An entry set providing fast iteration.

Method Summary

Methods

Modifier and Type	Method and Description
ObjectSet<Map.Entry<K,V>>	entrySet() Returns a set view of the mappings contained in this map.
ObjectSet<K>	keySet() Returns a set view of the keys contained in this map.
ObjectSet<Object2ObjectMap.Entry<K,V>>	object2ObjectEntrySet() Returns a type-specific set view of the mappings contained in this map.
ObjectCollection<V>	values() Returns a set view of the values contained in this map.

Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2ObjectFunction

defaultReturnValue, defaultReturnValue

Methods inherited from interface it.unimi.dsi.fastutil.Function

clear, containsKey, get, put, remove, size

Methods inherited from interface java.util.Map

clear, containsKey, containsValue, equals, get, hashCode, isEmpty, put, putAll, remove, size

Method Detail

entrySet

ObjectSet<Map.Entry<K,V>> entrySet()

Returns a set view of the mappings contained in this map.

Note that this specification strengthens the one given in Map.entrySet().

Specified by:

entrySet in interface Map<K,V>

Returns:

a set view of the mappings contained in this map.

See Also:

Map.entrySet()

object2ObjectEntrySet

ObjectSet<Object2ObjectMap.Entry<K,V>> object2ObjectEntrySet()

Returns a type-specific set view of the mappings contained in this map.

This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen entrySet() so that it returns an ObjectSet of objects of type Map.Entry (the latter makes it possible to access keys and values with type-specific methods).

Returns:

a type-specific set view of the mappings contained in this map.

See Also:

entrySet()

keySet

ObjectSet<K> keySet()

Returns a set view of the keys contained in this map.

Note that this specification strengthens the one given in Map.keySet().

Specified by:

keySet in interface Map<K,V>

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

ObjectCollection<V> values()

Returns a set view of the values contained in this map.

Note that this specification strengthens the one given in Map.values().

Specified by:

values in interface Map<K,V>

Returns:

a set view of the values contained in this map.

See Also:

Map.values()